RE: [PATCH] x86: pad assembly functions with INT3

[David Laight]

From: Alexey Dobriyan
> Sent: 07 May 2018 22:38
> 
> Use INT3 instead of NOP. All that padding between functions is
> an illegal area, no legitimate code should jump into it.
> 
> I've checked x86_64 allyesconfig disassembly, all changes looks sane:
> INT3 is only used after RET or unconditional JMP.

I thought there was a performance penalty (on at least some cpu)
depending on the number of and the actual instructions used for padding.

I believe that is why gcc generates a small number of very long 'nop'
instructions when padding code.

	David